<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            width:100px;
            height:100px;
            background-color: aquamarine;
        
        }
        
    </style>
</head>
<body>
    <div class="box"></div>
    <script>
        let box =document.querySelector(".box")
        function center (e){
            console.log(e)
            console.log(this)
            console.log(111)
        }
        box.onmousemove= throttle(center,2000)
        function throttle(fn,time){
            let lastTime = 0
            return function (e){
                let nowTime =Date.now()
                if(nowTime-lastTime<time) {
                    return
                }
                lastTime = nowTime
                fn.call(this,e)
            }
            
        }

    </script>
</body>
</html>